/*
* Copyright (c) 2010 AnjLab
*
* This file is part of
* Reference Implementation of Romanov's Polynomial Algorithm for 3-SAT Problem.
*
* Reference Implementation of Romanov's Polynomial Algorithm for 3-SAT Problem
* is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Reference Implementation of Romanov's Polynomial Algorithm for 3-SAT Problem
* is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with
* Reference Implementation of Romanov's Polynomial Algorithm for 3-SAT Problem.
* If not, see <http://www.gnu.org/licenses/>.
*/
package com.anjlab.sat3;
import java.io.IOException;
import java.io.InputStream;
import cern.colt.list.ObjectArrayList;
import cern.colt.map.OpenIntIntHashMap;
public class RomanovSKTFormulaReader implements IFormulaReader
{
public ITabularFormula readFormula(InputStream input) throws IOException
{
ObjectArrayList cts = new ObjectArrayList();
SimpleFormula formula = new SimpleFormula();
while (true)
{
int a = Helper.readInt(input);
if (a == Integer.MAX_VALUE)
{
break;
}
int b = Helper.readInt(input);
int c = Helper.readInt(input);
if (a == 0 && b == 0 && c == 0)
{
cts.add(formula);
formula = new SimpleFormula();
}
else
{
formula.add(new SimpleTriplet(a, b, c));
}
}
formula = new SimpleFormula();
for (int k = 0; k < cts.size(); k++)
{
ITabularFormula f = (ITabularFormula) cts.get(k);
for (int j = 0; j < f.getTiers().size(); j++)
{
ITier tier = f.getTier(j);
tier.inverse();
if (!tier.isEmpty())
{
formula.unionOrAdd(tier);
}
}
}
OpenIntIntHashMap varMappings = new OpenIntIntHashMap();
for (int i = 1; i <= formula.getVarCount(); i++)
{
varMappings.put(i, i);
}
formula.setVarMappings(varMappings);
return formula;
}
}